I have ridden the TB exhaust for 2 years now, and my neighbor has TB on his R6.
At idle / low RPM, you will hear a low rumble just loud enough rumble through the house. We live in an apt where my bedroom is 30-40 feet (10 meters) from the drive. I can hear his R6 when he rides by, but if he goes by it's no big deal. I think the key is try to be respectful. Yes it's loud, but you can be cool about it...like he and I are.
Don't idle for long periods when people are likely to be sleeping.
Don't rev or ride at high RPM near the house.
Basically, just use common sense and go for it.
Sound is breathtakingly beautiful.
As for the tips...
Last summer I took mine out. They reduce sound by a hardly noticeable amount.
Per
HowStuffWorks "What is a decibel and how is it measured?", the sound reduction is less than the difference between silence and a whisper...not much.
I have the blue ones on a blue 2009, and it looks sharp.
Although...the big hole looks sexy too. Personal preference.
As for being deaf...when riding on the interstate, the wind noise is so loud in HJC helmet, I can hardly hear the TB.
Would think expect hearing damage from that before the exhaust.
Riding around town, they are loud, but no obnoxious...below 5k. Get up around 10k and you have everyone's attention.